How to access IP address of Apple Watch programatically? I have used UIDevice extension in iOS for finding IP. This is an extension of UIDevice but which is not supported in watchOS what could be the other option?
extension UIDevice {
private struct InterfaceNames {
static let wifi = ["en0"]
static let wired = ["en2", "en3", "en4"]
static let cellular = ["pdp_ip0","pdp_ip1","pdp_ip2","pdp_ip3"]
static let supported = wifi + wired + cellular
}
func ipAddress() -> String? {
var ipAddress: String?
var ifaddr: UnsafeMutablePointer<ifaddrs>?
if getifaddrs(&ifaddr) == 0 {
var pointer = ifaddr
while pointer != nil {
defer { pointer = pointer?.pointee.ifa_next }
guard
let interface = pointer?.pointee,
interface.ifa_addr.pointee.sa_family == UInt8(AF_INET) || interface.ifa_addr.pointee.sa_family == UInt8(AF_INET6),
let interfaceName = interface.ifa_name,
let interfaceNameFormatted = String(cString: interfaceName, encoding: .utf8),
InterfaceNames.supported.contains(interfaceNameFormatted)
else { continue }
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
getnameinfo(interface.ifa_addr,
socklen_t(interface.ifa_addr.pointee.sa_len),
&hostname,
socklen_t(hostname.count),
nil,
socklen_t(0),
NI_NUMERICHOST)
guard
let formattedIpAddress = String(cString: hostname, encoding: .utf8),
!formattedIpAddress.isEmpty
else { continue }
ipAddress = formattedIpAddress
break
}
freeifaddrs(ifaddr)
}
return ipAddress
}
}
UIDevice.current.ipAddress()
How is this possible in watchOS
Related
Hi I am able to get local network IP address using this solution. I tried to use this solution to get broadcast IP address by using this Objective-C solution.
static func getBroadCastAddress() -> String? {
var address: String?
var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
if getifaddrs(&ifaddr) == 0 {
var ptr = ifaddr
while ptr != nil {
defer { ptr = ptr?.pointee.ifa_next }
guard let interface = ptr?.pointee else { return "" }
let addrFamily = interface.ifa_addr.pointee.sa_family
if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {
let name: String = String(cString: (interface.ifa_name))
if name == "en0" || name == "en2" || name == "en3" || name == "en4" || name == "pdp_ip0" || name == "pdp_ip1" || name == "pdp_ip2" || name == "pdp_ip3" {
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
getnameinfo(interface.ifa_addr, socklen_t((interface.ifa_addr.pointee.sa_len)), &hostname, socklen_t(hostname.count), nil, socklen_t(0), NI_NUMERICHOST)
// inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)
if let sinAddress = (interface.ifa_dstaddr as? sockaddr_in)?.sin_addr{ //=> It's always fail
address = String(utf8String: inet_ntoa(sinAddress))
}
}
}
}
freeifaddrs(ifaddr)
}
return address ?? ""
}
The problem is that I can't get sin_addr from interface like inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr) in objective c code.
Can anyone help me to get broadcast IP address in Cocoa using Swift? Thank you for your time.
let acceptedInterfaces = ["en0", "en2", "en3", "en4", "pdp_ip0", "pdp_ip1", "pdp_ip2", "pdp_ip3"]
func getBroadCastAddress() {
var interfaceAddresses : [String : String] = [:]
var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
if getifaddrs(&ifaddr) == 0 {
defer { freeifaddrs(ifaddr) }
var currentInterface = ifaddr
while currentInterface != nil {
defer { currentInterface = currentInterface!.pointee.ifa_next }
let interface = currentInterface!.pointee
let addrFamily = interface.ifa_addr.pointee.sa_family
guard addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) else { continue }
let interfaceName = String(cString: interface.ifa_name)
if acceptedInterfaces.contains(interfaceName) {
currentInterface!.withMemoryRebound(to: sockaddr_in.self, capacity: 1) {
sockaddr in
if let addressCString = inet_ntoa(sockaddr.pointee.sin_addr) {
interfaceAddresses[interfaceName] = String(cString: addressCString)
}
}
}
}
}
debugPrint(interfaceAddresses)
}
it prints:
["en0": "194.127.0.0"]
func getIPAddress() -> String {
var address: String?
var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
if getifaddrs(&ifaddr) == 0 {
var ptr = ifaddr
while ptr != nil {
defer { ptr = ptr?.pointee.ifa_next }
let interface = ptr?.pointee
let addrFamily = interface?.ifa_addr.pointee.sa_family
if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {
// wifi = ["en0"]
// wired = ["en2", "en3", "en4"]
// cellular = ["pdp_ip0","pdp_ip1","pdp_ip2","pdp_ip3"]
let name: String = String(cString: (interface!.ifa_name))
if name == "en0" || name == "en2" || name == "en3" || name == "en4" || name == "pdp_ip0" || name == "pdp_ip1" || name == "pdp_ip2" || name == "pdp_ip3" {
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
getnameinfo(interface?.ifa_addr, socklen_t((interface?.ifa_addr.pointee.sa_len)!), &hostname, socklen_t(hostname.count), nil, socklen_t(0), NI_NUMERICHOST)
address = String(cString: hostname)
}
}
}
freeifaddrs(ifaddr)
}
return address ?? ""
}
I have use this one and run the program in iOS simulator its giving nil value. I have added the Bridging-Header file and #include in it.
for retrieve the value I have used
let stringIPAddress : String = self.getIPAddress()
can I know is that possible to get IP address with simulator
Code works for Swift 5+ and iOS 13+
To get IPAddress of device on turning Wifi or Wired or Mobile data ON, use below method :
func getIPAddress() -> String? {
var address : String?
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>?
guard getifaddrs(&ifaddr) == 0 else { return nil }
guard let firstAddr = ifaddr else { return nil }
// For each interface ...
for ifptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
let interface = ifptr.pointee
// Check for IPv4 or IPv6 interface:
let addrFamily = interface.ifa_addr.pointee.sa_family
if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {
// Check interface name:
// wifi = ["en0"]
// wired = ["en2", "en3", "en4"]
// cellular = ["pdp_ip0","pdp_ip1","pdp_ip2","pdp_ip3"]
let name = String(cString: interface.ifa_name)
if name == "en0" || name == "en2" || name == "en3" || name == "en4" || name == "pdp_ip0" || name == "pdp_ip1" || name == "pdp_ip2" || name == "pdp_ip3" {
// Convert interface address to a human readable string:
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.pointee.sa_len),
&hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST)
address = String(cString: hostname)
}
}
}
freeifaddrs(ifaddr)
return address
}
Here, code/checks works for Wifi, Wired and Mobile data is:
if name == "en0" || name == "en2" || name == "en3" || name == "en4" || name == "pdp_ip0" || name == "pdp_ip1" || name == "pdp_ip2" || name == "pdp_ip3"
Hope will be helping! :)
I've been using this code, which has worked in simulator as well as playgrounds:
public class EnumerateNetworkInterfaces {
public struct NetworkInterfaceInfo {
let name: String
let ip: String
let netmask: String
}
public static func enumerate() -> [NetworkInterfaceInfo] {
var interfaces = [NetworkInterfaceInfo]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>? = nil
if getifaddrs(&ifaddr) == 0 {
// For each interface ...
var ptr = ifaddr
while( ptr != nil) {
let flags = Int32(ptr!.pointee.ifa_flags)
var addr = ptr!.pointee.ifa_addr.pointee
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
var mask = ptr!.pointee.ifa_netmask.pointee
// Convert interface address to a human readable string:
let zero = CChar(0)
var hostname = [CChar](repeating: zero, count: Int(NI_MAXHOST))
var netmask = [CChar](repeating: zero, count: Int(NI_MAXHOST))
if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
let address = String(cString: hostname)
let name = ptr!.pointee.ifa_name!
let ifname = String(cString: name)
if (getnameinfo(&mask, socklen_t(mask.sa_len), &netmask, socklen_t(netmask.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
let netmaskIP = String(cString: netmask)
let info = NetworkInterfaceInfo(name: ifname,
ip: address,
netmask: netmaskIP)
interfaces.append(info)
}
}
}
}
ptr = ptr!.pointee.ifa_next
}
freeifaddrs(ifaddr)
}
return interfaces
}
}
And then you can do something like this:
for interface in EnumerateNetworkInterfaces.enumerate() {
print("\(interface.name): \(interface.ip)")
}
I'm trying to convert this code snippet to Swift. I'm struggling on getting off the ground due to some difficulties.
- (BOOL) connectedToNetwork
{
// Create zero addy
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
// Recover reachability flags
SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
SCNetworkReachabilityFlags flags;
BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
CFRelease(defaultRouteReachability);
if (!didRetrieveFlags)
{
return NO;
}
BOOL isReachable = flags & kSCNetworkFlagsReachable;
BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
return (isReachable && !needsConnection) ? YES : NO;
}
The first and the main issue I'm having is on how to define and work with C structs. In the first line (struct sockaddr_in zeroAddress;) of the above code, I think they're defining a instance called zeroAddress from the struct sockaddr_in(?), I assume. I tried declaring a var like this.
var zeroAddress = sockaddr_in()
But I get the error Missing argument for parameter 'sin_len' in call which is understandable because that struct takes a number of arguments. So I tried again.
var zeroAddress = sockaddr_in(sin_len: sizeof(zeroAddress), sin_family: AF_INET, sin_port: nil, sin_addr: nil, sin_zero: nil)
As expected I get some other error Variable used within its own initial value. I understand the cause of that error too. In C, they declare the instance first and then fill up the parameters. Its not possible in Swift as far as I know. So I'm truly lost at this point on what to do.
I read Apple's official document on interacting with C APIs in Swift but it has no examples in working with structs.
Can anyone please help me out here? I'd really appreciate it.
Thank you.
UPDATE: Thanks to Martin I was able to get past the initial problem. But still Swift ain't making it easier for me. I'm getting multiple new errors.
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(UnsafePointer<Void>, UnsafePointer<zeroAddress>) // 'zeroAddress' is not a type
var flags = SCNetworkReachabilityFlags()
let didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, UnsafeMutablePointer<flags>) // 'flags' is not a type
defaultRouteReachability.dealloc(1) // 'SCNetworkReachabilityRef' does not have a member named 'dealloc'
if didRetrieveFlags == false {
return false
}
let isReachable: Bool = flags & kSCNetworkFlagsReachable // Cannot invoke '&' with an argument list of type '(#lvalue UInt32, Int)'
let needsConnection: Bool = flags & kSCNetworkFlagsConnectionRequired // Cannot invoke '&' with an argument list of type '(#lvalue UInt32, Int)'
return (isReachable && !needsConnection) ? true : false
}
EDIT 1: Okay I changed this line to this,
var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(UnsafePointer<Void>(), &zeroAddress)
The new error I'm getting at this line is 'UnsafePointer' is not convertible to 'CFAllocator'. How to you pass NULL in Swift?
Also I changed this line and the error is gone now.
let didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags)
EDIT 2: I passed nil in this line after seeing this question. But that answer contradicts with the answer here. It says there is no equivalent to NULL in Swift.
var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(nil, &zeroAddress)
Anyway I get a new error saying 'sockaddr_in' is not identical to 'sockaddr' at the above line.
(This answer was extended repeatedly due to changes in the Swift language, which made it a bit confusing. I have now rewritten it and removed everything which refers to Swift 1.x. The older code can
be found in the edit history if somebody needs it.)
This is how you would do it in Swift 2.0 (Xcode 7):
import SystemConfiguration
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}) else {
return false
}
var flags : SCNetworkReachabilityFlags = []
if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
return false
}
let isReachable = flags.contains(.Reachable)
let needsConnection = flags.contains(.ConnectionRequired)
return (isReachable && !needsConnection)
}
Explanations:
As of Swift 1.2 (Xcode 6.3), imported C structs have a default initializer in Swift, which initializes all of the struct's fields to zero, so the socket address structure can be initialized with
var zeroAddress = sockaddr_in()
sizeofValue() gives the size of this structure, this has
to be converted to UInt8 for sin_len:
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
AF_INET is an Int32, this has to be converted to the correct type for sin_family:
zeroAddress.sin_family = sa_family_t(AF_INET)
withUnsafePointer(&zeroAddress) { ... } passes the address of the
structure to the closure where it is used as argument for
SCNetworkReachabilityCreateWithAddress(). The UnsafePointer($0)
conversion is needed because that function expects a pointer to
sockaddr, not sockaddr_in.
The value returned from withUnsafePointer() is the return value
from SCNetworkReachabilityCreateWithAddress() and that has the
type SCNetworkReachability?, i.e. it is an optional.
The guard let statement (a new feature in Swift 2.0) assigns the unwrapped value to the defaultRouteReachability variable if it is
not nil. Otherwise the else block is executed and the function
returns.
As of Swift 2, SCNetworkReachabilityCreateWithAddress() returns
a managed object. You don't have to release it explicitly.
As of Swift 2, SCNetworkReachabilityFlags conforms to
OptionSetType which has a set-like interface. You create an
empty flags variable with
var flags : SCNetworkReachabilityFlags = []
and check for flags with
let isReachable = flags.contains(.Reachable)
let needsConnection = flags.contains(.ConnectionRequired)
The second parameter of SCNetworkReachabilityGetFlags has the type
UnsafeMutablePointer<SCNetworkReachabilityFlags>, which means that you have to
pass the address of the flags variable.
Note also that registering a notifier callback is possible as of
Swift 2, compare Working with C APIs from Swift and Swift 2 - UnsafeMutablePointer<Void> to object.
Update for Swift 3/4:
Unsafe pointers cannot be simply be converted to a pointer of a
different type anymore (see - SE-0107 UnsafeRawPointer API). Here the updated code:
import SystemConfiguration
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
zeroAddress.sin_family = sa_family_t(AF_INET)
guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
SCNetworkReachabilityCreateWithAddress(nil, $0)
}
}) else {
return false
}
var flags: SCNetworkReachabilityFlags = []
if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
return false
}
let isReachable = flags.contains(.reachable)
let needsConnection = flags.contains(.connectionRequired)
return (isReachable && !needsConnection)
}
Swift 3, IPv4, IPv6
Based on the Martin R's answer:
import SystemConfiguration
func isConnectedToNetwork() -> Bool {
guard let flags = getFlags() else { return false }
let isReachable = flags.contains(.reachable)
let needsConnection = flags.contains(.connectionRequired)
return (isReachable && !needsConnection)
}
func getFlags() -> SCNetworkReachabilityFlags? {
guard let reachability = ipv4Reachability() ?? ipv6Reachability() else {
return nil
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(reachability, &flags) {
return nil
}
return flags
}
func ipv6Reachability() -> SCNetworkReachability? {
var zeroAddress = sockaddr_in6()
zeroAddress.sin6_len = UInt8(MemoryLayout<sockaddr_in>.size)
zeroAddress.sin6_family = sa_family_t(AF_INET6)
return withUnsafePointer(to: &zeroAddress, {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
SCNetworkReachabilityCreateWithAddress(nil, $0)
}
})
}
func ipv4Reachability() -> SCNetworkReachability? {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
zeroAddress.sin_family = sa_family_t(AF_INET)
return withUnsafePointer(to: &zeroAddress, {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
SCNetworkReachabilityCreateWithAddress(nil, $0)
}
})
}
Swift 5, Using NWPathMonitor
import Network
func configureNetworkMonitor(){
let monitor = NWPathMonitor()
monitor.pathUpdateHandler = { path in
if path.status != .satisfied {
print("not connected")
}
else if path.usesInterfaceType(.cellular) {
print("Cellular")
}
else if path.usesInterfaceType(.wifi) {
print("WIFI")
}
else if path.usesInterfaceType(.wiredEthernet) {
print("Ethernet")
}
else if path.usesInterfaceType(.other){
print("Other")
}else if path.usesInterfaceType(.loopback){
print("Loop Back")
}
}
monitor.start(queue: DispatchQueue.global(qos: .background))
}
This has nothing to do with Swift, but the best solution is to NOT use Reachability to determine whether the network is online. Just make your connection and handle errors if it fails. Making a connection can at times fire up the dormant offline radios.
The one valid use of Reachability is to use it to notify you when a network transitions from offline to online. At that point you should retry failed connections.
The best solution is to use ReachabilitySwift class, written in Swift 2, and uses SCNetworkReachabilityRef.
Simple and easy:
let reachability = Reachability.reachabilityForInternetConnection()
reachability?.whenReachable = { reachability in
// keep in mind this is called on a background thread
// and if you are updating the UI it needs to happen
// on the main thread, like this:
dispatch_async(dispatch_get_main_queue()) {
if reachability.isReachableViaWiFi() {
print("Reachable via WiFi")
} else {
print("Reachable via Cellular")
}
}
}
reachability?.whenUnreachable = { reachability in
// keep in mind this is called on a background thread
// and if you are updating the UI it needs to happen
// on the main thread, like this:
dispatch_async(dispatch_get_main_queue()) {
print("Not reachable")
}
}
reachability?.startNotifier()
Working like a charm.
Enjoy
A SwiftUI take on Mithra Sigam's solution above:
import SwiftUI
import Network
class NetworkReachabilityManager: ObservableObject {
#Published var networkPathStatus: NWPath.Status
#Published var availableInterfaces: [NWInterface]
let monitor = NWPathMonitor()
init() {
monitor.start(queue: DispatchQueue.global(qos: .background))
let currentPath = monitor.currentPath
networkPathStatus = currentPath.status
availableInterfaces = currentPath.availableInterfaces
monitor.pathUpdateHandler = { [self] networkPath in
DispatchQueue.main.async {
networkPathStatus = networkPath.status
availableInterfaces = networkPath.availableInterfaces
}
}
}
deinit {
monitor.cancel()
}
}
updated juanjo's answer to create singleton instance
import Foundation
import SystemConfiguration
final class Reachability {
private init () {}
class var shared: Reachability {
struct Static {
static let instance: Reachability = Reachability()
}
return Static.instance
}
func isConnectedToNetwork() -> Bool {
guard let flags = getFlags() else { return false }
let isReachable = flags.contains(.reachable)
let needsConnection = flags.contains(.connectionRequired)
return (isReachable && !needsConnection)
}
private func getFlags() -> SCNetworkReachabilityFlags? {
guard let reachability = ipv4Reachability() ?? ipv6Reachability() else {
return nil
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(reachability, &flags) {
return nil
}
return flags
}
private func ipv6Reachability() -> SCNetworkReachability? {
var zeroAddress = sockaddr_in6()
zeroAddress.sin6_len = UInt8(MemoryLayout<sockaddr_in>.size)
zeroAddress.sin6_family = sa_family_t(AF_INET6)
return withUnsafePointer(to: &zeroAddress, {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
SCNetworkReachabilityCreateWithAddress(nil, $0)
}
})
}
private func ipv4Reachability() -> SCNetworkReachability? {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
zeroAddress.sin_family = sa_family_t(AF_INET)
return withUnsafePointer(to: &zeroAddress, {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
SCNetworkReachabilityCreateWithAddress(nil, $0)
}
})
}
}
Usage
if Reachability.shared.isConnectedToNetwork(){
}
This is in Swift 4.0
I am using this framework https://github.com/ashleymills/Reachability.swift
And Install Pod ..
In AppDelegate
var window: UIWindow?
var reachability = InternetReachability()!
var reachabilityViewController : UIViewController? = nil
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
reachabilityChecking()
return true
}
extension AppDelegate {
func reachabilityChecking() {
reachability.whenReachable = { reachability in
DispatchQueue.main.async {
print("Internet is OK!")
if reachability.connection != .none && self.reachabilityViewController != nil {
}
}
}
reachability.whenUnreachable = { _ in
DispatchQueue.main.async {
print("Internet connection FAILED!")
let storyboard = UIStoryboard(name: "Reachability", bundle: Bundle.main)
self.reachabilityViewController = storyboard.instantiateViewController(withIdentifier: "ReachabilityViewController")
let rootVC = self.window?.rootViewController
rootVC?.present(self.reachabilityViewController!, animated: true, completion: nil)
}
}
do {
try reachability.startNotifier()
} catch {
print("Could not start notifier")
}
}
}
The reachabilityViewController screen will appear if internet is not there
Is there a way to open network settings programmatically? Closest thing I know is opening the main settings page:
let settingsURL = NSURL(string: UIApplicationOpenSettingsURLString)!
UIApplication.sharedApplication().openURL(settingsURL)
I want to be able to detect if the internet connection is over WiFi or Ethernet.
The way to detect this is to look at the name of the network interfaces. For Mac and Apple TV, en0 and en1 refer to the wired and wireless interfaces respectively.
Add this to your bridging header (or create one if needed):
#include <ifaddrs.h>
#include <net/if_dl.h>
Then use this Swift code to get the information you need:
struct Networking {
enum NetworkInterfaceType: String, CustomStringConvertible {
case Ethernet = "en0"
case Wifi = "en1"
case Unknown = ""
var description: String {
switch self {
case .Ethernet:
return "Ethernet"
case .Wifi:
return "Wifi"
case .Unknown:
return "Unknown"
}
}
}
static var networkInterfaceType: NetworkInterfaceType {
if let name = Networking().getInterfaces().first?.name, let type = NetworkInterfaceType(rawValue: name) {
return type
}
return .Unknown
}
static var isConnectedByEthernet: Bool {
let networking = Networking()
for addr in networking.getInterfaces() {
if addr.name == NetworkInterfaceType.Ethernet.rawValue {
return true
}
}
return false
}
static var isConnectedByWiFi: Bool {
let networking = Networking()
for addr in networking.getInterfaces() {
if addr.name == NetworkInterfaceType.Wifi.rawValue {
return true
}
}
return false
}
// Credit to Martin R http://stackoverflow.com/a/34016247/600753 for this lovely code
// New Swift 3 implementation needed upated to replace unsafepointer calls with .withMemoryRebound
func getInterfaces() -> [(name : String, addr: String, mac : String)] {
var addresses = [(name : String, addr: String, mac : String)]()
var nameToMac = [ String: String ]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>?
guard getifaddrs(&ifaddr) == 0 else { return [] }
guard let firstAddr = ifaddr else { return [] }
// For each interface ...
for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
let flags = Int32(ptr.pointee.ifa_flags)
if var addr = ptr.pointee.ifa_addr {
let name = String(cString: ptr.pointee.ifa_name)
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
switch Int32(addr.pointee.sa_family) {
case AF_LINK:
nameToMac[name] = withUnsafePointer(to: &addr) { unsafeAddr in
unsafeAddr.withMemoryRebound(to: sockaddr_dl.self, capacity: 1) { dl in
dl.withMemoryRebound(to: Int8.self, capacity: 1) { dll in
let lladdr = UnsafeRawBufferPointer(start: dll + 8 + Int(dl.pointee.sdl_nlen), count: Int(dl.pointee.sdl_alen))
if lladdr.count == 6 {
return lladdr.map { String(format:"%02hhx", $0)}.joined(separator: ":")
} else {
return nil
}
}
}
}
case AF_INET, AF_INET6:
// Convert interface address to a human readable string:
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if (getnameinfo(addr, socklen_t(addr.pointee.sa_len),
&hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
let address = String(cString: hostname)
addresses.append( (name: name, addr: address, mac : "") )
}
default:
break
}
}
}
}
freeifaddrs(ifaddr)
// Now add the mac address to the tuples:
for (i, addr) in addresses.enumerated() {
if let mac = nameToMac[addr.name] {
addresses[i] = (name: addr.name, addr: addr.addr, mac : mac)
}
}
return addresses
}
}
Usage is:
debugPrint(Networking.networkInterfaceType)
Or:
switch Networking.networkInterfaceType {
case .Ethernet:
// do something
break
case .Wifi:
// do something else
break
default:
break
}
For iOS 12.0+, tvOS 12.0+, macOS 10.14+ and watchOS 5.0+ apps you can use NWPathMonitor to solve the problem that you described in your question. Add this code to your application(_:didFinishLaunchingWithOptions:) implementation (Swift 5.1.3/Xcode 11.3.1):
let pathMonitor = NWPathMonitor()
pathMonitor.pathUpdateHandler = { path in
if path.status == .satisfied {
if path.usesInterfaceType(.wifi) {
print("wifi")
} else if path.usesInterfaceType(.cellular) {
print("cellular")
} else if path.usesInterfaceType(.wiredEthernet) {
print("wiredEthernet")
} else if path.usesInterfaceType(.loopback) {
print("loopback")
} else if path.usesInterfaceType(.other) {
print("other")
}
} else {
print("not connected")
}
}
pathMonitor.start(queue: .global(qos: .background))
And don't forget to add import Network to the top of the file.
You can use Reachability API.
let reachability: Reachability = Reachability.reachabilityForInternetConnection()
(reachability.currentReachabilityStatus().value == ReachableViaWiFi.value) // For WiFi
(reachability.currentReachabilityStatus().value == ReachableViaWWAN.value) // For WWAN
(reachability.currentReachabilityStatus().value == NotReachable.value) // For No Internet
I want to get the IP address (like 192.168.0.1 or 87.12.56.50) from DNS query in Swift. I tried 100 times with 100 different methods ... Nothing helped me, so I'll have to ask for help.
This is my code so far:
let host = CFHostCreateWithName(nil,"subdomain.of.stackoverflow.com").takeUnretainedValue();
CFHostStartInfoResolution(host, .Addresses, nil);
var success: Boolean = 0;
let addresses = CFHostGetAddressing(host, &success).takeUnretainedValue() as NSArray;
if(addresses.count > 0){
let theAddress = addresses[0] as NSData;
println(theAddress);
}
OK ... These are the links for the code I tried to implement without success:
https://gist.github.com/mikeash/bca3a341db74221625f5
How to perform DNS query on iOS
Create an Array in Swift from an NSData Object
Does CFHostGetAddressing() support ipv6 DNS entries?
Do a simple DNS lookup in Swift
Your code retrieves the address as a "socket address" structure.
getnameinfo() can be used to convert the address into a numerical IP string
(code recycled from https://stackoverflow.com/a/25627545/1187415,
now updated to Swift 2):
let host = CFHostCreateWithName(nil,"www.google.com").takeRetainedValue()
CFHostStartInfoResolution(host, .Addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray?,
let theAddress = addresses.firstObject as? NSData {
var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
if getnameinfo(UnsafePointer(theAddress.bytes), socklen_t(theAddress.length),
&hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
if let numAddress = String.fromCString(hostname) {
print(numAddress)
}
}
}
Output (example): 173.194.112.147
Note also the usage of takeRetainedValue() in the first line, because
CFHostCreateWithName() has "Create" in its name the therefore returns a (+1) retained
object.
Update for Swift 3/Xcode 8:
let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()
CFHostStartInfoResolution(host, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray?,
let theAddress = addresses.firstObject as? NSData {
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length),
&hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
let numAddress = String(cString: hostname)
print(numAddress)
}
}
Or, to get all IP addresses for the host:
let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()
CFHostStartInfoResolution(host, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray? {
for case let theAddress as NSData in addresses {
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length),
&hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
let numAddress = String(cString: hostname)
print(numAddress)
}
}
}
Refer to the following Swift code to get DNS resolution for a website. One method uses CFHostStartInfoResolution whereas other one uses gethostbyname.
Both these APIs support all/multiple IP address resolution.
private func urlToIP_cfHostResolution(_ url: String) -> [String] {
var ipList: [String] = []
let host = CFHostCreateWithName(nil,url as CFString).takeRetainedValue()
CFHostStartInfoResolution(host, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray? {
for case let theAddress as NSData in addresses {
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length),
&hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
ipList.append(String(cString: hostname))
}
}
}
return ipList
}
This method returns ["151.101.129.69", "151.101.1.69", "151.101.193.69", "151.101.65.69"] for www.stackoverflow.com
private func urlToIP_gethostbyname(_ url: URL) -> [String] {
var ipList: [String] = []
guard let hostname = url.host else {
return ipList
}
guard let host = hostname.withCString({gethostbyname($0)}) else {
return ipList
}
guard host.pointee.h_length > 0 else {
return ipList
}
var index = 0
while host.pointee.h_addr_list[index] != nil {
var addr: in_addr = in_addr()
memcpy(&addr.s_addr, host.pointee.h_addr_list[index], Int(host.pointee.h_length))
guard let remoteIPAsC = inet_ntoa(addr) else {
return ipList
}
ipList.append(String.init(cString: remoteIPAsC))
index += 1
}
return ipList
}
This method also returns ["151.101.129.69", "151.101.1.69", "151.101.193.69", "151.101.65.69"] for www.stackoverflow.com
Hope this helps.
A number of the answers are using the deprecated bytes to retrieve the sockaddr to supply to getnameinfo. We’d use address.withUnsafeBytes now. For example, in Swift 5:
/// Returns the string representation of the supplied address.
///
/// - parameter address: Contains a `(struct sockaddr)` with the address to render.
///
/// - returns: A string representation of that address.
func stringRepresentation(forAddress address: Data) -> String? {
address.withUnsafeBytes { pointer in
var hostStr = [Int8](repeating: 0, count: Int(NI_MAXHOST))
let result = getnameinfo(
pointer.baseAddress?.assumingMemoryBound(to: sockaddr.self),
socklen_t(address.count),
&hostStr,
socklen_t(hostStr.count),
nil,
0,
NI_NUMERICHOST
)
guard result == 0 else { return nil }
return String(cString: hostStr)
}
}